A sealing structure for a ball valve

Abstract

The application belongs to the field of hydraulic valves, and particularly relates to a sealing structure for a ball valve, the ball valve being provided with an integrated valve body, a medium channel and a valve cavity being respectively formed in the valve body, the medium channel and the valve cavity being in communication with each other, the sealing structure comprising a matching surface arranged in the valve cavity and a valve core assembly installed in the valve cavity; the matching surface comprises a first matching surface and a second matching surface which are perpendicular to the axis of the medium channel; the valve core assembly comprises a ball, a valve seat sleeve assembly, a valve seat support assembly and an adjusting assembly, the adjusting assembly being in operable contact with the first matching surface, and the right side of the valve seat support assembly being in sealing contact with the second matching surface. The sealing structure can improve the sealing performance under low-temperature working conditions, facilitates the online disassembly and maintenance of the ball valve, prolongs the service life of the ball valve, and can be widely applied to the transportation pipelines of various low-temperature media.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hydraulic valves, and particularly relates to a sealing structure for a ball valve. BACKGROUND

[0002] In the process of pipeline transportation, a ball valve is needed to cut off the medium in the pipeline. If the medium transported in the pipeline has a low temperature, irregular cold shrinkage deformation or size change of the parts in the ball valve will occur, which will seriously affect the sealing performance of the ball valve. Therefore, the existing ball valve sealing structure design has poor sealing performance when transporting low-temperature medium, and is prone to problems such as medium leakage. On the other hand, the existing ball valve sealing structure design cannot realize online disassembly and maintenance of the ball valve, reducing the service life of the ball valve. SUMMARY

[0003] To solve the problems in the prior art, the purpose of the present application is to provide a sealing structure for a ball valve, which can improve the sealing performance under low-temperature working conditions, meet the use requirements of low-temperature medium transportation, facilitate online disassembly and maintenance of the ball valve, improve the service life of the ball valve, and can be widely applied to the transportation pipelines of various low-temperature media.

[0004] To achieve the above-mentioned purpose of the application, the present application provides the following technical solutions:

[0005] A sealing structure for a ball valve, the ball valve having a valve body integrally arranged, a medium channel and a valve cavity being respectively formed in the valve body, the medium channel and the valve cavity being in communication with each other, the sealing structure comprising a matching surface arranged in the valve cavity and a valve core assembly installed in the valve cavity.

[0006] The matching surface comprises a first matching surface and a second matching surface perpendicular to the axis of the medium channel, and a third matching surface perpendicular to the first matching surface or the second matching surface.

[0007] The valve core assembly comprises a ball, a valve seat sleeve assembly, a valve seat support assembly and an adjusting assembly, the valve seat sleeve assembly and the valve seat support assembly cooperatively forming a cavity, and the ball being arranged in the cavity; the bottom of the valve seat sleeve assembly is in contact with the third matching surface for positioning, the left side of the valve seat sleeve assembly is provided with the adjusting assembly, the adjusting assembly is in operable contact with the first matching surface, the right side of the valve seat sleeve assembly is in sealing contact with the ball, the left side of the valve seat support assembly is in sealing contact with the ball, and the right side of the valve seat support assembly is in sealing contact with the second matching surface.

[0008] Preferably, the adjusting assembly comprises a cam bolt, a cam washer, a butterfly spring and a locking plate; the butterfly spring and the cam washer are sequentially sleeved on the outer periphery of the valve seat sleeve assembly, one end of the butterfly spring is in contact with the first matching surface, and the other end is in contact with the cam washer; the cam bolt is in driving cooperation with the valve seat sleeve assembly and is in driving connection with the cam washer, and rotating the cam bolt can drive the cam washer to move to compress the butterfly spring, thereby adjusting the sealing pre-tightening force of the valve core assembly; the locking plate is matched with the cam bolt to lock the cam bolt at a predetermined position of the valve seat sleeve assembly.

[0009] Preferably, the cam bolt comprises a cam portion and a threaded portion, the cam portion is in abutment with the cam washer, and the threaded portion is in driving cooperation with the valve seat sleeve assembly.

[0010] Preferably, the valve seat sleeve assembly comprises a valve seat sleeve body and a first valve seat, the valve seat sleeve body comprises a sleeve main body and a first column and a second column extending along one side of the sleeve main body, the diameter of the second column is smaller than that of the first column; wherein the cam washer is sleeved on the outer peripheral surface of the first column, and the butterfly spring is sleeved on the outer peripheral surface of the second column; when the valve core assembly is installed in the valve body, there is a first gap between the end face of the second column and the first matching surface.

[0011] Preferably, a first fluid passage is formed at the second column in the axial direction of the second column; a through hole is formed at the sleeve main body in a direction perpendicular to the axial direction of the second column; a cavity for installing the ball is formed in the inside of the sleeve main body, and the first fluid passage and the through hole are both in communication with the cavity.

[0012] Preferably, an annular first installation groove is further formed in the inside of the sleeve main body, a first valve seat is arranged in the first installation groove, and the first valve seat is in sealing contact with the ball.

[0013] Preferably, two screw grooves are arranged on the sleeve main body in a direction perpendicular to the axial direction of the second column, the screw grooves extend from the top of the sleeve main body to the bottom of the sleeve main body, the two screw grooves are arranged symmetrically about the axial direction of the second column, and the screw grooves are in driving cooperation with the threaded portion of the cam bolt.

[0014] Preferably, the length of the cam portion and the threaded portion is greater than the outer diameter of the cam washer, and the arc length of the cross section of the screw groove is greater than the arc length of the cross section of the threaded portion.

[0015] Preferably, the valve seat support assembly comprises a valve seat support body, a second valve seat and a sealing gasket, the valve seat support body comprises a support body and a protrusion extending along one side of the support body, the protrusion is inserted into the cavity formed in the inside of the sleeve body to form the cavity for installing the ball.

[0016] Preferably, a second installation groove in the shape of a ring is further formed in the inside of the valve seat support body, the second installation groove is provided with a second valve seat, the second valve seat is in sealing contact with the ball; a third installation groove in the shape of a ring is formed on the side away from the second installation groove, the third installation groove is provided with a sealing gasket, the sealing gasket is in sealing contact with the second matching surface.

[0017] Compared with the prior art, the sealing structure for the ball valve provided by the present application has the following beneficial technical effects:

[0018] 1. In the present application, the valve body is integrally provided, the valve cavity formed in the inside has a first matching surface and a second matching surface perpendicular to the axis of the medium channel, one side of the valve core assembly is in operable contact with the first matching surface, and the other side is in sealing contact with the second matching surface. In the above arrangement, by changing the conventional inner and outer shaft hole sealing to planar sealing and using the adjusting assembly to provide initial sealing pre-tightening force and automatically compensate for the wear of the valve core assembly, the problem of uneven and irregular deformation between the valve body and the valve seat support assembly, between the ball and the valve seat sleeve assembly and the valve seat support assembly caused by low temperature, which leads to the decline of sealing performance, is solved, and the sealing performance of the ball valve in the closed state is improved.

[0019] At the same time, when disassembling the ball valve, the valve core assembly can be taken out from the valve body or installed into the valve body from directly above the valve body after removing the valve cover, the installation and disassembly are simple, and the sealing pre-tightening force of the valve core assembly can be adjusted by operating the adjusting assembly during disassembly, so that the ball valve can be conveniently disassembled and maintained online, and the service life of the ball valve is improved.

[0020] 2. In the present application, the cam bolt is provided with a cam portion and a threaded portion, the cam portion abuts against the cam washer, and the threaded portion is in transmission cooperation with the threaded groove on the sleeve body, so that the initial sealing pre-tightening force of the valve core assembly can be simply and conveniently adjusted. In the long-term use of the ball valve, if the first valve seat and / or the second valve seat are worn, the butterfly spring can automatically compensate for the wear of the first valve seat and / or the second valve seat, ensuring good sealing performance of the ball valve. When the first valve seat and / or the second valve seat are further worn and the butterfly spring cannot provide further sealing pre-tightening force, the valve cover and the locking plate are removed, the cam bolt is rotated to drive the cam washer to move and compress the butterfly spring, and the butterfly spring provides the pre-tightening force required for the valve core assembly to seal again, thereby improving the convenience of online disassembly and maintenance of the ball valve and prolonging the service life of the ball valve.

[0021] Secondly, by setting the length of the cam part and the threaded part greater than the outer diameter of the cam washer, the cam part can apply uniform force to the cam washer from top to bottom, so that the butterfly spring can provide stable sealing pre-tightening force.

[0022] Furthermore, by setting the arc length of the threaded groove cross section greater than the arc length of the threaded part cross section, the cam bolt and the sleeve body can be stably transmissionally connected, the cam bolt is prevented from falling off from the threaded groove, and the reliability of the ball valve during use is improved.

[0023] And the locking plate can prevent unnecessary rotation of the cam bolt during use, thereby locking the cam bolt at a predetermined position of the sleeve body, ensuring that the cam bolt can stably contact the cam washer, so that the butterfly spring provides stable sealing pre-tightening force, and the reliability of the ball valve during use is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of the sealing structure for the ball valve of the present application;

[0025] Figure 2 is a partial schematic view of the sealing structure of the present application;

[0026] Figure 3 is a structural schematic view of the valve seat support body of the present application;

[0027] Figure 4 is a sectional view of the valve seat sleeve body of the present application;

[0028] Figure 5 is a top view of the valve seat sleeve body of the present application;

[0029] Figure 6 is a structural schematic view of the cam bolt of the present application;

[0030] Figure 7 is a structural schematic view of the locking plate of the present application.

[0031] In the drawings, the meanings of the symbols marked are as follows:

[0032] 1, valve body; 2, valve stem; 3, valve core assembly;

[0033] 11, first mating surface; 12, second mating surface; 13, third mating surface; 14, first groove; 15, second groove; 16, sealing groove; 17, third groove; 18, connecting part; 19, guide part;

[0034] 31, ball; 32, valve seat sleeve assembly; 33, valve seat support assembly; 34, cam bolt; 35, cam washer; 36, butterfly spring; 37, locking plate; 38, first gap;

[0035] 321, sleeve body; 322, first cylinder; 323, second cylinder; 324, chamber; 325, through hole; 326, first fluid passage; 327, first mounting groove; 328, first valve seat; 329, threaded groove;

[0036] 331, protrusion; 332, support body; 333, second mounting groove; 334, third mounting groove; 335, second fluid passage; 336, gasket; 337, second valve seat;

[0037] 341, cam portion; 342, threaded portion; 371, locking hole. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application.

[0039] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but merely represents some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0041] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, or the orientation or positional relationship commonly understood by those skilled in the art, such terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0043] Referring to the drawings Figure 1 - the drawings Figure 7As shown, the present application provides a sealing structure for a ball valve, the ball valve has an integrated valve body 1, the top of the valve body 1 can be installed with a valve cover (not shown in the figure), the valve body 1 is respectively provided with a medium passage and a valve cavity, the medium passage and the valve cavity are communicated with each other, the sealing structure comprises a matching surface arranged in the valve cavity and a valve core assembly 3 installed in the valve cavity, one end of the valve stem 2 is drivingly connected with the valve core assembly 3.

[0044] Wherein, the matching surface comprises a first matching surface 11 and a second matching surface 12 perpendicular to the axis of the medium passage, and a third matching surface 13 perpendicular to the first matching surface 11 or the second matching surface 12.

[0045] Wherein, the valve core assembly 3 comprises a ball 31, a valve seat sleeve assembly 32, a valve seat support assembly 33 and an adjusting assembly, the valve seat sleeve assembly 32 and the valve seat support assembly 33 cooperate to form a cavity, and the ball 31 is arranged in the cavity. The bottom of the valve seat sleeve assembly 32 is in contact with the third matching surface 13, the left side of the valve seat sleeve assembly 32 is provided with the adjusting assembly, the adjusting assembly is in operable contact with the first matching surface 11, and the adjusting assembly is operated to adjust the sealing pre-tightening force of the valve core assembly 3. The right side of the valve seat sleeve assembly 32 is in sealing contact with the ball 31, the left side of the valve seat support assembly 33 is in sealing contact with the ball 31, and the right side of the valve seat support assembly 33 is in sealing contact with the second matching surface 12.

[0046] Preferably, the adjusting assembly comprises a cam bolt 34, a cam washer 35 and a butterfly spring 36; the butterfly spring 36 and the cam washer 35 are sequentially sleeved on the outer periphery of the valve seat sleeve assembly 32, one end of the butterfly spring 36 is in contact with the first matching surface 11, and the other end is in contact with the cam washer 35; the cam bolt 34 is drivingly matched with the valve seat sleeve assembly 32 and drivingly connected with the cam washer 35, rotating the cam bolt 34 can drive the cam washer 35 to move to compress the butterfly spring 36, thereby adjusting the sealing pre-tightening force of the valve core assembly 3, so as to provide the valve core assembly 3 with an initial sealing pre-tightening force and automatically compensate for the wear of the valve core assembly 3 during use, and ensure the sealing performance of the ball valve in the closed state.

[0047] In the above embodiment, the valve body is integrally arranged, the valve cavity opened in the inside has a first matching surface and a second matching surface perpendicular to the axis of the medium passage, one side of the valve core assembly is in operable contact with the first matching surface, and the other side is in sealing contact with the second matching surface. In the above arrangement, by changing the conventional inner and outer shaft hole sealing to planar sealing, and using the adjusting assembly to provide the initial sealing pre-tightening force and automatically compensate for the wear of the valve core assembly, the problem of uneven and irregular deformation between the valve body and the valve seat support assembly, between the ball and the valve seat sleeve assembly and the valve seat support assembly caused by low temperature, which leads to the decline of the sealing performance, is solved, and the sealing performance of the ball valve in the closed state is improved.

[0048] Meanwhile, when the ball valve is disassembled, only after the bonnet is removed, the valve core assembly is taken out from the valve body or installed into the valve body from the top of the valve body, so that the installation and dismounting is simple, and the sealing pre-tightening force of the valve core assembly can be adjusted by operating the adjusting assembly during the dismounting, so that the ball valve can be conveniently dismounted and maintained on line, and the service life of the ball valve is improved.

[0049] Preferably, the adjusting assembly further comprises a locking plate 37 cooperating with the cam bolt 34 to lock the cam bolt 34 at a predetermined position of the valve seat sleeve assembly 32.

[0050] Preferably, the cam bolt 34 comprises a cam portion 341 and a threaded portion 342, the cam portion 341 is in transmission connection with the cam washer 35 or is arranged directly against the cam washer 35, and the threaded portion 342 is in transmission cooperation with the valve seat sleeve assembly 32. The length of the cam portion 341 and the threaded portion 342 is greater than the outer diameter of the cam washer 35, so that uniform force is applied to the cam washer 35.

[0051] Preferably, the valve seat sleeve assembly 32 comprises a valve seat sleeve body and a first valve seat 328, the valve seat sleeve body comprises a sleeve main body 321 and a first column body 322 and a second column body 323 extending along one side of the sleeve main body 321, and the diameter of the second column body 323 is smaller than that of the first column body 322. The cam washer 35 is sleeved on the outer circumferential surface of the first column body 322, and the butterfly spring 36 is sleeved on the outer circumferential surface of the second column body 323. When the valve core assembly 3 is installed in the valve body 1, the end surface of the second column body 323 and the first matching surface 11 have a first gap 38 therebetween.

[0052] Preferably, a first fluid passage 326 is formed at the second column body 323 in the axial direction of the second column body 323; a through hole 325 is formed at the sleeve main body 321 in a direction perpendicular to the axial direction of the second column body 323, and the diameter of the through hole 325 is greater than that of the valve stem 2; a cavity 324 for installing the ball 31 is formed in the inside of the sleeve main body 321, and the first fluid passage 326 and the through hole 325 are in communication with the cavity 324.

[0053] Preferably, an annular first installation groove 327 is further formed in the inside of the sleeve main body 321, the first valve seat 328 is arranged in the first installation groove 327, and the first valve seat 328 is in sealing contact with the ball 31. The first valve seat 328 is made of PCTFE plastic.

[0054] Preferably, two screw grooves 329 are arranged on the sleeve body 321 in the direction perpendicular to the axial direction of the second cylinder 323, the screw grooves 329 extend from the top of the sleeve body 321 to the bottom of the sleeve body 321, the two screw grooves 329 are arranged symmetrically about the axial direction of the second cylinder 323, the screw grooves 329 are in transmission cooperation with the threaded part 342 of the cam bolt 34, the arc length of the cross section of the screw grooves 329 is greater than the arc length of the cross section of the threaded part 342, so as to ensure that the cam bolt 34 and the sleeve body 321 are stably connected in transmission.

[0055] Preferably, the locking holes 371 adapted to the cam bolt 34 are symmetrically arranged on the locking plate 37, the locking holes 371 can prevent the cam bolt 34 from rotating, so as to lock the cam bolt 34 at the predetermined position of the sleeve body 321. In use, first, the cam bolt 34 is rotated to the predetermined position of the sleeve body 321, then the locking holes 371 on the locking plate 37 are respectively sleeved to the end portions of the two cam bolts 34, the locking holes 371 are used to prevent the cam bolt 34 from further rotating, so as to lock the cam bolt 34 at the predetermined position of the sleeve body 321.

[0056] Preferably, the valve seat supporting assembly 33 comprises a valve seat supporting body, a second valve seat 337 and a sealing gasket 336, the valve seat supporting body comprises a supporting body 332 and a protruding portion 331 extending from one side of the supporting body 332, the protruding portion 331 is inserted into the cavity 324 formed in the inside of the sleeve body 321, so as to form a cavity for mounting the ball 31.

[0057] Preferably, an annular second mounting groove 333 is further formed in the inside of the valve seat supporting body, the second valve seat 337 is arranged in the second mounting groove 333, the second valve seat 337 is in sealing contact with the ball 31, wherein the second valve seat 337 is made of PCTFE plastic. An annular third mounting groove 334 is formed on the side away from the second mounting groove 333, the sealing gasket 336 is arranged in the third mounting groove 334, the sealing gasket 336 is in sealing contact with the second matching surface 12.

[0058] Preferably, a second fluid passage 335 is formed in the inside of the valve seat supporting body, wherein the first fluid passage 326, the second fluid passage 335, the medium passage formed in the valve body 1 and the medium passage formed in the ball 31 can communicate with each other.

[0059] In the above-mentioned embodiments, the cam bolt is provided with a cam portion and a threaded portion, the cam portion abuts against the cam washer, and the threaded portion is in transmission cooperation with the threaded groove on the sleeve body, so that the initial sealing pre-tightening force of the valve core assembly can be simply and conveniently adjusted. In the long-term use of the ball valve, if the first valve seat and / or the second valve seat is worn, the butterfly spring can automatically compensate for the wear of the first valve seat and / or the second valve seat, so as to ensure that the ball valve has good sealing performance. When the first valve seat and / or the second valve seat is further worn and the butterfly spring cannot further provide the sealing pre-tightening force, the valve cover is only needed to be removed, the locking plate is only needed to be removed, the cam bolt is only needed to be rotated, the cam washer is only needed to be driven to move to compress the butterfly spring, and the butterfly spring is only needed to provide the pre-tightening force required by the valve core assembly for sealing again, so that the on-line disassembly and maintenance convenience of the ball valve is improved, and the service life of the ball valve is also improved.

[0060] Secondly, the length of the cam portion and the threaded portion is greater than the outer diameter of the cam washer, so that the cam portion can apply uniform force to the cam washer from top to bottom, and the butterfly spring can provide stable sealing pre-tightening force.

[0061] Furthermore, the arc length of the threaded groove cross section is greater than the arc length of the threaded portion cross section, so that the cam bolt and the sleeve body are stably in transmission cooperation, the cam bolt is prevented from falling off from the threaded groove, and the reliability of the ball valve in use is improved.

[0062] The locking plate is arranged to prevent unnecessary rotation of the cam bolt in use, so that the cam bolt is locked at a predetermined position of the sleeve body, the cam bolt can stably contact the cam washer, the butterfly spring can provide stable sealing pre-tightening force, and the reliability of the ball valve in use is improved.

[0063] Preferably, a first groove 14, a second groove 15 and a third groove 17 are sequentially arranged on the valve body 1 in the axial direction of the valve rod 2, the diameters of the first groove 14, the second groove 15 and the third groove 17 are sequentially reduced, and a guide portion 19 is arranged on the inner periphery of the first groove 14. The guide portion 19 cooperates with the valve cover to guide the valve cover during installation of the valve cover. The third groove 17 cooperates with the valve cover to position the valve cover during installation of the valve cover. The first sealing member is arranged in the second groove 15, and the first sealing member is used to realize the primary sealing between the valve body 1 and the valve cover when the valve cover is installed on the valve body 1. A sealing groove 16 is arranged on the valve body 1, and the second sealing member is arranged in the sealing groove 16, and the second sealing member is used to realize the secondary sealing between the valve body 1 and the valve cover. A connecting portion 18 is arranged on the valve body 1, and the connecting portion 18 is used to realize the fixed connection between the valve body 1 and the valve cover.

[0064] In the above-mentioned embodiments, by arranging the first groove, the second groove and the third groove and the like features on the valve body respectively, the guiding, positioning and sealing of the valve cover can be realized when the valve cover is mounted on the valve body, the above-mentioned arrangement can quickly realize the assembly and disassembly of the valve cover, the on-line disassembly and maintenance of the ball valve can be facilitated, and the service life of the ball valve is improved.

[0065] The above examples are only used to illustrate the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, the present application is not limited to the above-mentioned specific embodiments, and any modification or equivalent replacement of the present application; all technical solutions and improvements without departing from the spirit and scope of the application are all covered in the scope of claims of the present application.

Claims

1. A sealing structure for a ball valve, characterized in that: The ball valve has an integrally formed valve body, in which a medium channel and a valve cavity are respectively opened, the medium channel and the valve cavity are interconnected, and the sealing structure includes a mating surface provided in the valve cavity and a valve core assembly installed in the valve cavity; The mating surfaces include a first mating surface and a second mating surface perpendicular to the axis of the medium channel, and a third mating surface perpendicular to the first mating surface or the second mating surface. The valve core assembly includes a ball, a valve seat sleeve assembly, a valve seat support assembly, and an adjusting assembly. The valve seat sleeve assembly and the valve seat support assembly cooperate to form a cavity, and the ball is disposed in the cavity. The bottom of the valve seat sleeve assembly is in contact with and positioned against the third mating surface. The adjusting assembly is disposed on the left side of the valve seat sleeve assembly and is operably in contact with the first mating surface. The right side of the valve seat sleeve assembly is in sealing contact with the ball. The left side of the valve seat support assembly is in sealing contact with the ball, and the right side of the valve seat support assembly is in sealing contact with the second mating surface. The adjusting assembly includes a cam bolt, a cam washer, a butterfly spring, and a locking plate. The butterfly spring and the cam washer are sequentially sleeved on the outer periphery of the valve seat sleeve assembly. One end of the butterfly spring contacts the first mating surface, and the other end contacts the cam washer. The cam bolt is driven to engage with the valve seat sleeve assembly and is also driven to connect with the cam washer. Rotating the cam bolt drives the cam washer to move and compress the butterfly spring, thereby adjusting the sealing preload of the valve core assembly. The locking plate engages with the cam bolt to lock the cam bolt at a predetermined position on the valve seat sleeve assembly. The cam bolt includes a cam portion and a threaded portion. The cam portion abuts against the cam washer, and the threaded portion engages with the valve seat sleeve assembly. The lengths of the cam portion and the threaded portion are greater than the outer diameter of the cam washer, and the arc length of the threaded groove cross-section is greater than the arc length of the threaded portion cross-section.

2. The sealing structure as described in claim 1, characterized in that: The valve seat sleeve assembly includes a valve seat sleeve body and a first valve seat. The valve seat sleeve body includes a sleeve body and a first column and a second column extending along one side of the sleeve body. The diameter of the second column is smaller than the diameter of the first column. The cam washer is sleeved on the outer peripheral surface of the first column, and the butterfly spring is sleeved on the outer peripheral surface of the second column. When the valve core assembly is installed in the valve body, there is a first gap between the end face of the second column and the first mating surface.

3. The sealing structure as described in claim 2, characterized in that: A first fluid channel is provided at the second column along the axial direction of the second column; a through hole is provided at the sleeve body along the axial direction perpendicular to the second column; a chamber for installing the ball is provided inside the sleeve body, and the first fluid channel and the through hole are both connected to the chamber.

4. The sealing structure as described in claim 3, characterized in that: An annular first mounting groove is also provided inside the sleeve body, and a first valve seat is provided in the first mounting groove, which is in sealing contact with the ball.

5. The sealing structure as described in claim 4, characterized in that: Along the axial direction perpendicular to the second column, two threaded grooves are provided on the sleeve body. The threaded grooves extend from the top of the sleeve body to the bottom of the sleeve body. The two threaded grooves are symmetrically arranged about the axial direction of the second column. The threaded grooves are in drive engagement with the threaded portion of the cam bolt.

6. The sealing structure as described in claim 5, characterized in that: The valve seat support assembly includes a valve seat support body, a second valve seat, and a sealing gasket. The valve seat support body includes a support body and a protrusion extending along one side of the support body. The protrusion is inserted into the cavity opened inside the sleeve body to form the cavity for mounting the ball.

7. The sealing structure as described in claim 6, characterized in that: An annular second mounting groove is provided inside the valve seat support body, and a second valve seat is provided in the second mounting groove. The second valve seat is in sealing contact with the ball. An annular third mounting groove is provided on the side away from the second mounting groove. A sealing gasket is provided in the third mounting groove, and the sealing gasket is in sealing contact with the second mating surface.

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